Chrome 開發工具沒有顯示任何泄漏，但任務管理器會顯示直到 chrome 崩潰

Question

所以我有這個相當消耗 CPU 的應用程序： https://codepen.io/team/amcharts/pen/47c41af971fe467b8b41f29be7ed1880

這是一個 Canvas，上面畫了很多東西。

HTML：

<script src="https://cdn.amcharts.com/lib/5/index.js"></script>
<script src="https://cdn.amcharts.com/lib/5/xy.js"></script>
<script src="https://cdn.amcharts.com/lib/5/themes/Animated.js"></script>
<div id="chartdiv" style="width:100%; height:400px"></div>

JavaScript：

/**
 * ---------------------------------------
 * This demo was created using amCharts 5.
 * 
 * For more information visit:
 * https://www.amcharts.com/
 * 
 * Documentation is available at:
 * https://www.amcharts.com/docs/v5/
 * ---------------------------------------
 */

// Create root element
// https://www.amcharts.com/docs/v5/getting-started/#Root_element
var root = am5.Root.new("chartdiv");


// Set themes
// https://www.amcharts.com/docs/v5/concepts/themes/
root.setThemes([
  am5themes_Animated.new(root)
]);


// Generate random data
var value = 100;

function generateChartData() {
  var chartData = [];
  var firstDate = new Date();
  firstDate.setDate(firstDate.getDate() - 1000);
  firstDate.setHours(0, 0, 0, 0);

  for (var i = 0; i < 50; i++) {
    var newDate = new Date(firstDate);
    newDate.setSeconds(newDate.getSeconds() + i);

    value += (Math.random() < 0.5 ? 1 : -1) * Math.random() * 10;

    chartData.push({
      date: newDate.getTime(),
      value: value
    });
  }
  return chartData;
}

var data = generateChartData();


// Create chart
// https://www.amcharts.com/docs/v5/charts/xy-chart/
var chart = root.container.children.push(am5xy.XYChart.new(root, {
  focusable: true,
  panX: true,
  panY: true,
  wheelX: "panX",
  wheelY: "zoomX",
  scrollbarX:am5.Scrollbar.new(root, {orientation:"horizontal"})
}));

var easing = am5.ease.linear;


// Create axes
// https://www.amcharts.com/docs/v5/charts/xy-chart/axes/
var xAxis = chart.xAxes.push(am5xy.DateAxis.new(root, {
  maxDeviation: 0.5,
  groupData: false,
  extraMax:0.1, // this adds some space in front
  extraMin:-0.1,  // this removes some space form th beginning so that the line would not be cut off
  baseInterval: {
    timeUnit: "second",
    count: 1
  },
  renderer: am5xy.AxisRendererX.new(root, {
    minGridDistance: 50
  }),
  tooltip: am5.Tooltip.new(root, {})
}));

var yAxis = chart.yAxes.push(am5xy.ValueAxis.new(root, {
  renderer: am5xy.AxisRendererY.new(root, {})
}));


// Add series
// https://www.amcharts.com/docs/v5/charts/xy-chart/series/
var series = chart.series.push(am5xy.ColumnSeries.new(root, {
  name: "Series 1",
  xAxis: xAxis,
  yAxis: yAxis,
  valueYField: "value",
  valueXField: "date",
  tooltip: am5.Tooltip.new(root, {
    pointerOrientation: "horizontal",
    labelText: "{valueY}"
  })
}));

series.data.setAll(data);

// Add cursor
// https://www.amcharts.com/docs/v5/charts/xy-chart/cursor/
var cursor = chart.set("cursor", am5xy.XYCursor.new(root, {
  xAxis: xAxis
}));
cursor.lineY.set("visible", false);


// Update data every second
setInterval(function () {
  addData();
}, 100)


function addData() {
  var lastDataItem = series.dataItems[series.dataItems.length - 1];

  var lastValue = lastDataItem.get("valueY");
  var newValue = value + ((Math.random() < 0.5 ? 1 : -1) * Math.random() * 5);
  var lastDate = new Date(lastDataItem.get("valueX"));
  var time = am5.time.add(new Date(lastDate), "second", 1).getTime();
  series.data.removeIndex(0);
  series.data.push({
    date: time,
    value: newValue
  })

  var newDataItem = series.dataItems[series.dataItems.length - 1];
  newDataItem.animate({
    key: "valueYWorking",
    to: newValue,
    from: lastValue,
    duration: 600,
    easing: easing
  });

  var animation = newDataItem.animate({
    key: "locationX",
    to: 0.5,
    from: -0.5,
    duration: 600
  });
  if (animation) {
    var tooltip = xAxis.get("tooltip");
    if (tooltip && !tooltip.isHidden()) {
      animation.events.on("stopped", function () {
        xAxis.updateTooltip();
      })
    }
  }
}

setTimeout(function(){
  xAxis.zoom(0.5, 1)
}, 1500)

運行一段時間后，所有 Chromium 瀏覽器都會崩潰。 即使開發工具沒有顯示任何 memory 泄漏 - 偵聽器的數量、節點和堆大小保持不變（堆最初可能會增加一點，但隨后會穩定下來）。 但任務管理器顯示 memory 正在增長。 重要的是 - 瀏覽器 window 必須集中。 奇怪的是，如果我使用滾動條縮小圖表或調整 window 或關閉並打開選項卡，memory 可能會下降到正常水平。 這件事發生在開發工具打開和關閉的情況下。

這不會發生在 Firefox 上，所以我相信這是一些瀏覽器問題。 感謝任何見解。

Answer 1

所以我們發現這確實是一個 Chromium 問題，在上下文上調用setTransform （如果沒有做任何其他事情）會導致泄漏（在分析時不可見）和崩潰。 我們將其報告為錯誤，並希望它會得到修復。 同時，我們正在研究一種解決方法來避免這種情況。

var canvas = document.createElement('canvas');
document.body.appendChild(canvas);

var context = canvas.getContext('2d');

function loop() {
  requestAnimationFrame(() => {
    loop();

    for (var j = 0; j < 10000; ++j) {
      context.setTransform(0.5, 1, 1, 0.5, 1, 1);
    }
  });
}

loop();